Triphenylamine oligomers (OTPAs, n=4-10) were synthesized by dehalogenation polymerization of 4,4′-dihalogentriphenylamines. The OTPAs are a white powder, which is stable on exposure to the air and soluble in benzene, chlorobenzene, chloroform and THF. The OTPAs were characterized by IR, H-NMR and UV-visible spectroscopy measurements. OTPA films prepared by casting from solutions or vapor deposition exhibit a high drift mobility of holes and accordingly double layer organic photoconductors including the OTPA layer show a high electrophotographic sensitivity.
Olga K. Kocheleva, Sergey A. Lebedev, Boris V. Kotov, Eduard. S. Petrov, Alek R. Tameev, Alexey A. Kozlov, Anatoly V. Vannikov, "Catalytic Dehalogenation Polymerization of 4,4′-Dihalogentriphenylamines in the Presence of a Nickel Complex" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP14), 1998, pp 528 - 531, https://doi.org/10.2352/ISSN.2169-4451.1998.14.1.art00048_2